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There are 12 ten-letter words beginning with PHOTOT

PHOTOTAXES	• phototaxes n. Plural of phototaxis. • PHOTOTAXIS n. growth or movement determined by light.
PHOTOTAXIS	• phototaxis n. (Biology) The movement of an organism either towards or away from a source of light. • PHOTOTAXIS n. growth or movement determined by light.
PHOTOTONIC	• phototonic adj. Relating to phototonus. • PHOTOTONIC adj. relating to phototonus, the sensitivity of a living organism to light.
PHOTOTONUS	• phototonus n. Sensitivity to, or irritation caused by, light. • PHOTOTONUS n. the sensitivity of a living organism to light.
PHOTOTOXIC	• phototoxic adj. (Medicine, of a medicine or cosmetic) Causing damage to the skin when exposed to light. • PHOTOTOXIC adj. rendering the skin susceptible to damage (as sunburn or blisters).
PHOTOTROPE	• PHOTOTROPE n. a substance exhibiting phototropism, movement directed by light.
PHOTOTROPH	• phototroph n. A photoautotroph. • PHOTOTROPH n. a plant which uses light to generate energy needed to absorb nutrients.
PHOTOTROPY	• phototropy n. Phototropism. • PHOTOTROPY n. change of colour due to wavelength of incident light.
PHOTOTUBES	• phototubes n. Plural of phototube. • PHOTOTUBE n. an electron tube with a photoemissive cathode.
PHOTOTYPED	• phototyped v. Simple past tense and past participle of phototype. • PHOTOTYPE v. to print by this means.
PHOTOTYPES	• phototypes n. Plural of phototype. • phototypes v. Third-person singular simple present indicative form of phototype. • PHOTOTYPE v. to print by this means.
PHOTOTYPIC	• phototypic adj. Of or pertaining to a phototype or phototypy. • PHOTOTYPIC adj. of or pertaining to a phototype or phototypy.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 16 words
Scrabble in French: 3 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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